#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;

typedef long long int ll;


int main() 
{
    ll n,i,sum=0;
    cin>>n;
    vector<ll> v(n);
    for(i=0;i<n;i++)
    {
        cin>>v[i];
    }
    sort(v.rbegin(),v.rend());
    for(i=0;i<n;i++)
    {
        sum+=v[i]*pow(2,i);
    }
    cout<<sum;
    
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    return 0;
}